External combustion engine
heat engine driven by combustion in an external source / From Wikipedia, the free encyclopedia
An external combustion engine (EC engine) is an engine which converts heated fluid into kinetic energy. The heated fluid, called working fluid, can be air, hot water, or pressurized water which is heated in a boiler. The fluid used to power the engine is cooled and reused in a closed cycle and the fluid is dumped in an open cycle.